The Phantom FGR2 INAS (QRA) fast align was 105 secs I recall. As long as the 28v DC power supply was plugged in this kept the IN platform heaters on (and powered up the intercom/telebrief?). You first had to get AC online though, I think, following the first engine start/genny online. You then got the IN into fast align and waited for the 'align' light to stop flashing (and go out) before taxying. Considering that this was technology that came from the TSR2 era Ferranti did a good job at coming up with a way to 'short-cut' the align. It relied on doing a very good 'normal' align to get the IN platform alignment set, and then setting this into a stored heading mode.
I got pretty good at 'cocking' Battle Flight jets in RAFG, especially the 'extra' jets for weekends.